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Dessert

Lemon Sponge

A light lemon-flavored sponge cake with custard and lemon frosting.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 10 ingredients
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Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓

Lemon Sponge

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point. The book gives no cooking times either; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.

Make the batter

  1. Preheat the oven to 350°F (175°C).

  2. In a large bowl, beat the eggs and sugar until light and fluffy.

  3. Gently fold in the flour, lemon juice, lemon rind, and baking powder.

  4. Divide the batter into two greased oblong baking pans.

  5. Bake for 25-30 minutes or until a toothpick comes out clean.

Make the frosting and custard

  1. For the frosting, mix lemon juice with powdered sugar until thick.

  2. Frost the top of one layer, then spread with custard.

  3. To make the custard, heat milk in a saucepan.

  4. In a bowl, whisk together the egg, cornstarch, and sweetener.

  5. Slowly add the hot milk to the egg mixture, stirring constantly.

  6. Return to the saucepan and cook until thickened, then flavor with vanilla.

Assemble

  1. Spread the custard on the frosted layer and top with the second layer.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Milk + vanillatop 5% of all pairs
    Smell alikemoderate
    Cooked together19,187 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

  2. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  3. Flour + vanillatop 12% of all pairs
    Smell alikemoderate
    Cooked together19,241 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Lemon + vanillatop 15% of all pairs
    Smell alikemoderate
    Cooked together5,961 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 recipes: they work on texture and structure more than aroma.

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Eggs
Whipped with sugar to trap air, and their proteins set to give the cake structure.
Granulated sugar
Sweetens the cake and helps beat the eggs into a light, stable foam.
All-purpose flour
Its proteins form the gluten network that gives the sponge its structure.
Baking powder
Releases gas in the batter, helping the cake rise in the oven.
Milk
Provides liquid for the custard, which gives moisture and a soft, creamy texture.
Cornstarch
Thickens the custard as it heats, giving it a smooth, spreadable body.

The step that matters

Cooking the custard. Hot milk must be added slowly while stirring so the egg does not scramble. The custard then needs to cook until the cornstarch thickens it fully, or it will stay runny.

Swap the lemon

How well each one fits the dish's main ingredients (sugar, flour, egg, milk, vanilla):

  1. Raisinfits better
  2. Figfits better
  3. Blueberryfits better
  4. Lemonthe original

Fit is the average pairing score against sugar, flour, egg, milk, vanilla. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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